The White House's18-1/2-foot-tall Douglass fir tree grown at Crystal Springs Farm, Lehighton, is one in a long line of Christmas trees supplied to presidents and first families stretching all the way back to the late 1800s.

A slide-lecture about the history behind this and other White House holiday customs will be presented, 1 p.m. Dec. 14, Lehigh Valley Heritage Museum (LVHM), 432 W. Walnut St., Allentown.